001 /**
002 * Copyright (c) 2010 Yahoo! Inc. All rights reserved.
003 * Licensed under the Apache License, Version 2.0 (the "License");
004 * you may not use this file except in compliance with the License.
005 * You may obtain a copy of the License at
006 *
007 * http://www.apache.org/licenses/LICENSE-2.0
008 *
009 * Unless required by applicable law or agreed to in writing, software
010 * distributed under the License is distributed on an "AS IS" BASIS,
011 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012 * See the License for the specific language governing permissions and
013 * limitations under the License. See accompanying LICENSE file.
014 */
015 package org.apache.oozie.workflow.lite;
016
017 import org.apache.hadoop.io.Writable;
018 import org.apache.oozie.util.ParamChecker;
019
020 import java.io.DataInput;
021 import java.io.DataOutput;
022 import java.io.IOException;
023 import java.util.ArrayList;
024 import java.util.Collections;
025 import java.util.List;
026
027 //TODO javadoc
028 public class NodeDef implements Writable {
029 private String name;
030 private Class<? extends NodeHandler> handlerClass;
031 private String conf;
032 private List<String> transitions = new ArrayList<String>();
033
034 NodeDef() {
035 }
036
037 NodeDef(String name, String conf, Class<? extends NodeHandler> handlerClass, List<String> transitions) {
038 this.name = ParamChecker.notEmpty(name, "name");
039 this.conf = conf;
040 this.handlerClass = ParamChecker.notNull(handlerClass, "handlerClass");
041 this.transitions = Collections.unmodifiableList(ParamChecker.notEmptyElements(transitions, "transitions"));
042 }
043
044 public boolean equals(NodeDef other) {
045 return !(other == null || getClass() != other.getClass() || !getName().equals(other.getName()));
046 }
047
048 public int hashCode() {
049 return name.hashCode();
050 }
051
052 public String getName() {
053 return name;
054 }
055
056 public Class<? extends NodeHandler> getHandlerClass() {
057 return handlerClass;
058 }
059
060 public List<String> getTransitions() {
061 return transitions;
062 }
063
064 public String getConf() {
065 return conf;
066 }
067
068 @Override
069 @SuppressWarnings("unchecked")
070 public void readFields(DataInput dataInput) throws IOException {
071 name = dataInput.readUTF();
072 String handlerClassName = dataInput.readUTF();
073 if ((handlerClassName != null) && (handlerClassName.length() > 0)) {
074 try {
075 handlerClass = (Class<? extends NodeHandler>) Class.forName(handlerClassName);
076 }
077 catch (ClassNotFoundException ex) {
078 throw new IOException(ex);
079 }
080 }
081 conf = dataInput.readUTF();
082 if (conf.equals("null")) {
083 conf = null;
084 }
085 int numTrans = dataInput.readInt();
086 transitions = new ArrayList<String>(numTrans);
087 for (int i = 0; i < numTrans; i++) {
088 transitions.add(dataInput.readUTF());
089 }
090 }
091
092 @Override
093 public void write(DataOutput dataOutput) throws IOException {
094 dataOutput.writeUTF(name);
095 dataOutput.writeUTF(handlerClass.getName());
096 if (conf != null) {
097 dataOutput.writeUTF(conf);
098 }
099 else {
100 dataOutput.writeUTF("null");
101 }
102 dataOutput.writeInt(transitions.size());
103 for (String transition : transitions) {
104 dataOutput.writeUTF(transition);
105 }
106 }
107
108 }